from random import random 
from math import sqrt
from time import clock 
DARTS = 1000
hits = 0.0
clock() 
for i in range(1,DARTS+1):
    x,y = random(),random()
    dist = sqrt(x**2 + y**2)
    if dist <= 1.0 :
        hits = hits + 1
pi = 4 * (hits/DARTS) 
print('pi值是{}.'.format(pi))
print('运行的时间是：{:.5f}s'.format(clock()))